Drawing mechanism for textile slivers



R. BALMES SOLANAS ZSM DRAWING MECHANISM FOR TEXTILE SLIVERS Filed .Jun'e 15, 193s 2 sheets-sheet 1 25 5W BALB/:Es soLANAs DRAWING' MECHANISM FOR TEXTILE SLIVERS ZUSEM Filed June 15, 1938 2 Sheets-Sheet 2 Patented June 25, 1940 UNlTED STATES PATENT @ENCE DRAWING MECHSM EGE, TEX'JTMJE @DIVERS Application .lune l5, 1938,

lin Spain .time

6 i'jlaims.

My invention refers to drawing mechanisms for textile slivers provided with various pairs of rollers, used in spinning or preparatory machines for the spinning of cotton or other textile fibres and will be described in the present specification as applied to a drawing mechanism of four pairs or rollers, composed of a first pair of feeding rollers or entrance rollers for the sliver, a second pair of intermediate rollers, which produce a draft in combination with the feeding rollers, a third pair of retaining or slippage rollers, light and of small diameter and lastly a pair of final drawing rollers or delivery rollers for the thread, which are those that produce the final draft of the sliver held by the intermediate rollers, the fibres slipping between the retaining or slippage rollers.

In such drawing mechanisms, in the cases in which the first drawing is very strong, as happens in certain special mechanisms in which the first 2@ pair of rollers or feeding rollers is constituted by a iiuted roller and a roller covered with points or pins (porcupine roller) it happens that the fibres of the sliver in the length comprised between the two central pairs of rollers, remain very loose from one another and distributed in a great width which is greater than the thickness of the sliver on entering in the drawing mechanism. This has the disadvantage that the libres drawn by the nal drawing rollers or delivery rollers bring with them at intervals other libres of the sliver, producing irregularities in the thickness of the thread and at the same time owing to the fibres remaining so loose and occupying too great a width they have a tendency to wind on the rollers and on the thread or sliver leaving the final drawing rollers the fibres are not completely caught up by the twist but certain parts remain loose giving the thread a hairy'appearance that it is dimcult to correct.

The present invention avoids these troubles ensuring a proper guidance of the sliver and reducing at the same time the width in order to bring the fibres together.

The invention consists in arranging between the two central pairs of rollers, a roller that conducts or accompanies the sliver from one pair of rollers to the other, combined with one or more condensers or reducers of the width of the sliver, which oblige the fibres to approach together. This'roller conductor of the sliver is arranged simply resting on the lower rollers of the two central pairs of rollers and is combined with a framework which carries on the lower part a small bar on which there can slide from one side to the other a reducer of the width of the liti Serial No. 213,90@ 30, i937 sliver, so that this is obliged to pass below the conducting roller and to enter into the throat of the reducer. There may be combined also a second sliver reducer situated between the slippage rollers a-nd the final delivery rollers and supported by some arms that proceed from the same framework that surrounds the conducting roller.

In the attached drawings there is shown the necessary part of a drawing mechanism of four pairs of rollers embodying the invention.

Figure l is a top View of the drawing meche anism with the top rollers of all the pairs of rollers removed.

Figure 2 is a cross section of the drawing mechanism according to the line U-II of Figure l.

Figure 3 is a similar section according to the line IH--IIE of Figure l.

Figure 4 is a perspective view on a larger scale of the conducting roller of the sliver with the framework that holds the lower reducer and Figure 5 is a similar view of a modification in which the framework in addition to holding the lower reducer carries a second reducer which remains interposed between the slippage rollers u,

and the final drawing rollers.

As is shown in the drawings, the drawing mechanism includes in the usual way a pair of feeding rollers 0 2, a pair of intermediate rollers 3-l, a pair of retaining or slippage rollers F-Et of small diameter and a pair of final drawing or delivery rollers E-E.

Rollers i, t, and t are conveniently loaded by means of a double saddle formed by two pieces t, it pivotally connected at the point il and which by means of the stay l2 receive in the usual way the action of a weight not shown in the drawings. This saddle a, l@ forms at the same time a rest for the clearers it.

In order to accompany the sliver in the part that goes from the tangency line of the two intermediate rollers 3-41 to the tangency line of the slippage rollers l-t, there is arranged in accordance with this invention a roller it resting freely on the two rollers t and "i, This roller itl has not any support to hold it but simply rests on the rollers 3 and 'l and is prevented from moving axially, on the one hand by the pressure saddle 9 and on the other by the support iti of the top rollers of the drawing mechanism.

By the action of this conducting roller it the sliver, instead of leaving the roller t in the same tangency line of this roller with the top roller t is applied on the surface of the roller t until it arrives at the tangency line of the rollers t 2 and I4 and then passes below the roller I4 until it arrives at the tangency line of the roller I4 with the slippage roller 1 and from this point remains applied on the surface of the roller 1 until its tangency line with the top roller 8. This on the one hand reduces greatly the length of sliver that remains without support on the lower part and in addition owing to the large contact surface between the sliver and the rollers 3--1 increases the adherence of the bres with these. rollers and reduces considerably the pos- 1 sibility of the fibres coming olf the sliver or becoming disarranged.

'dle 22 which serves vafter which the With this roller I4 there is combined a condenser or reducer I8 of the width of the sliver, situated underneath of the roller I4. This reducer I8 is held by a small framework I9 resting on the gudgeons 20 of the roller I4 and which presents on the lower part a, small bar 2| on which is threaded the reducer I8 in such a way that it can slide laterally following the reciprocating movement of the sliver. Preferably the framework I9 should form a prolongation or hanto be able to lift easily the roller I4 with the reducer I8. The sliver on being caught by the pair of rollers 1, 8 is obliged to adapt itself against the lower surface of the roller I4 and against the reducer I8 penetrating into the throat made in the lower part of this reducer, thus reducing the width of the sliver by the converging form of this throat.

It is advisable to arrange a second reducer 23 of the width of the sliver, situated between the slippage rollers 1-8 and the delivery rollers 5 6. This reducer may be supported in different ways but preferably it is arranged supported by the same framework that supports the lower reducer I8 as is shown in the drawings and in greater detail in Fig. 5. For this, there is arranged on the framework I9 a supplementary framework formed by the two arms 24 joined together by a crosspiece 25 and by a front bar 26 on which there is threaded the reducer 23 in such a way that it may slide following the reciprocating movement of the sliver. The arms 24 have slots 21 that flt in the projections 28 of the framework I9 in order that the reducer 23 may situate itself in the proper position, adapting itself to the different separations or distances between the pairs of rollers of the drawing mechanism.

Below the arms 24 the framework carries projecting fingers 29 for limiting the downward movement of these arms when there is withdrawn from the machine the roller I4 with the framework .and the reducers and in this Way to obtain that on putting it back again, the reducer 23 shall take the proper working position.

Both the reducer I8 as well as the reducer 23 have the throat made in the lower part, which not only is more convenient owing to the manner in which the sliver passes in this apparatus, but in addition has the important advantage that the roller I4 with the framework and the two reducers may be withdrawn without in any way having to dismount the drawing mechanism. Preferably there is made in the reducer 23 a shoulder or inclined plane 33 on one of its sides, such as is shown in Fig. in order to facilitate the threading of the sliver on placing into position the roller I4 with the reducers. Thanks to this inclined plane, the sliver itself in its cross reciprocating movement makes the reducer 23 swing slightly until it fits in the throat of the same, sliver draws in the normal Way the reducer 23 in its movement.

By the effect of the arrangement described. the reducer 23 can engage itself easily in the angle formed by the two rollers 5-3 and the slots 21 allow it to always adopt this correct position, even when the separation between the rollers 5-6 and 3--4 varies.

I claim:

1. In a drawing mechanism according to claim 3, a framework surrounding the conducting roller for the sliver and carrying underneath said roller the reducer of the width of the sliver, two arms projecting from the sides of said framework towards the delivery rollers, said arms being connected together and carrying a second reducer of the width of the sliver in such a way that it remains lodged in the angle formed by the two delivery rollers; the conducting roller, the framework and the two reducers forming thus a unit which can be easily removed and replaced in the mechanism.

2. In a drawing mechanism according to claim 3, a framework surrounding the conducting roller for the sliver and carrying underneath said roller a reducer of the width of the sliver, said framework comprsing two lateral plates, means for connecting said plates, and a lower bar on which the reducer may slide freely; two arms in said framework which carry a second reducer of the width of the sliver near the delivery rollers, said arms having slots for sliding over fingers projecting from said lateral plates in such a way that the reducer may engage itself automatically the angle formed by the two delivery rollers, and projecting fingers in said lateral plates underneath said arms to limit the movement of said arms when said conducting roller, with said framework and said reducers, are removed from the mechanism.

3. A drawing mechanism for textile slivers comprising a series of pairs of rollers, a conducting roller for the sliver located between two consecutive pairs of rollers, said conducting roller resting freely on the lower rollers of said consecutive pairs and a reducer of the width of the sliver located below said conducting roller and closely adjacent the same to accompany the sliver in the remaining space between said consecutive pairs and simultaneously reducing the width of the sliver.

4. A drawing mechanism for textile slivers comprising a series of pairs of rollers, a conducting roller for the sliver located between two consecu, tive pairs of rollers, said conducting roller resting freely on the lower rollers of said consecutive pairs, a reducer of the width of the sliver located below said conducting roller and closely adjacent the same to accompany the sliver in the remaining space between said consecutive pairs and simultaneously reducing the width of the sliver, gudgeons upon said conducting roller, a framework mounted on said gudgeons surrounding said conducting roller and a bar upon the lower portion of said framework on which said reducer is mounted freely slidable.

5. A drawing mechanism for textile slivers comprising a series of pairs of rollers, a conducting roller for the sliver located between two consecutive pairs of rollers, said conducting roller resting freely on the lower rollers of said consecutive pairs, a reducer of the width of the sliver located below said conducting roller and closelyadjacent the same to accompany the sliver in the remaining space between said consecutive pairs and simultaneously reducing the width of the sliver, a framework surrounding said conducting roller prising a series of in which said reducer is mounted, saidy framework comprising two lateral plates, means for connecting said plates, a lateral bar on said framework on which said reducer is freely slidable, two arms upon said framework, a second reducer of the width of the sliver supported from said last mentioned arms adjacent the delivery rollers, said arms having slots, fingers projecting from saidi roller with the framework and reducers without breaking the sliver.

6. A drawing mechanism for textile slivers compairs of rollers, a conducting roller for the sliver located between two consecutive pairs of rollers, saidconducting roller resting freely on the lower rollers of said consecutive pairs, a reducer of the width of the sliver located below said conducting roller and closely adjacent the same to accompany the sliver in the remaining space between said consecutive pairs and simultaneously reducing the Width of the sliver, a

Vframework surrounding said conducting roller in which said reducer is mounted, said framework comprising two lateral plates, means for connecting said plates, a lateral bar on said framework on which said reducer is freely slidable, two arms upon said framework, a second reducer of the width of the sliver supported from said last mentioned arms adjacent the delivery rollers, said arms having slots, fingers projecting from said lateral plates into said slots so that said second reducer may be automatically engaged in the angle formed by the two delivery rollers, projecting iingers in said lateral plates located underheath said arms for limiting the movement o f said arms when said conducting roller together with said framework and said reducers are re-` moved fromthe mechanism and one of said reducers having an inclined plane at its lower side 20 leading to the Vthroat of said reducer in such a way that on replacing the conducting roller with the reducers in the mechanism the sliver in its reciprocating movement will act on said inclined plane to lift the reducer and permit the sliver to 25 automatically enter intovthe throat of such reducer.

l RAMON BALMES SOLANAS. 

